Draft regulator



W. CRAIG. lIJRAFT REGULATOR. APPHCATION FILED SEPT. 5. 19 l9.

Patented` Oct. 10,1922.

llilll/IF IIAIIIA..

y 'WILEY CRAIG, l'0F CKNCDINATI, 9X0.

naar@ nnennsron dpplicntlon tiled September 5, $1919. Serial lilo. lle.

bythe pressure oi air over the grate of the' furnace, or other chamber that is dampercontrolled. My object is to obtain a suhstantially uniform pressure in furnaces and other damper-controlled devices, in an autoA matic manner.

ln the devices of the past, it has been the practice to hinge plates either horizontally or vertically in an opening in the side of a furnace, and by said plates control the damper operating motor. lt has also been for many years the practice to control the damper motor byineans of a pneumatic diaphra or the like. l

ln all such' devices, there is expensive construction and more or less delicate mechanisnl, and it is the object of my invention to provide a stout and inexpensive device, which `is very compact and is readily adjusted. ln this connection l employ as a controlling member an inverted tloat, which is suspended onthe' valve rod that controls, the Water motork so that the valve Works on 'the axis of the doet. The Water motor is mounted on the top of the float tank, Without lose of space, and some of' the Water 'flowing through the valve ports runs into the tank and maintains the fluid level therein.

The motor is of special construction and positive andaccnrate in its operation, losing calculated 'to adjust the damper tothe position desired Without undue oscillation, and 1cya simple operation. v

Other advantages 'of my device 'Will'he noted hereinafter, and I accomplish my ohjects hy that certain construction and arrangement otl parts to he hereinafter more specifically pointed' out and claimed.

ln the drawings,

"Figure l is a central vertical section taken c through the device.

Figure is a top plan view thereof. The device is shown as controlling a damvor otherwise, and the per l set in a stack 2. On the shalt of the damper is a bell crank 3, one end of which is counterhalanced hy a weicht 4, and the other connected to a cable 5. n f

Ylhe motor comprises a casing or cylinder li, invvhich slides a piston?. This piston is surrounded by acup .leather 8, and together with the piston and the cup leather on the end of the piston rod 9, is the 'follower head l0.

The piston rod passes through a stuffing hon ll on the upper end of the motor and'is connected to. the cable 5, so 'that the' position of the piston rod controls the position of the damper, acting as it does against the counter-Weight ai.

The piston in the cylinder is maintained under constant pressurev during the normal operation of the device by hydrant pressure I cylinder lor this pun pose is provided with an inlet port l2 Yfor the supply ,eine 13, the supply pipe being provided with a stop ccclr 'for closin od the Water when desired, although it Will he understood that in .normal operation the valve is open. @ne side ol the cylinder is provided with a valve chamber 18 in the Wall o the cylinder, and there are a series ot small ports 19, .one above the other. from the cylinder into this valve chaniher, The valve chamber is also provided with an cutlet port l? at the bottoni.

The piston valve 19 snugly its the eisten valve chamber and its position controls the port 19 which isv open to How of' Water through'the cylinder.

lhus upon operation of the piston valve,

the point subjected to water pressure against 'the piston is dehnitelyf located as at the under edgeof the upper exposed port 19, andsince the countervveicht on the damper lever tendsfto pull np t e piston itself, it `will rise as ar as it is permitted against the pressure el the stream of 'water inaintained through the motor. The .lovv of 4'Water is not excessive, as hut oneV port is menace a pressure-controlled motor, an inverted vessel float, areciprocating device on the float for controlling the -pressure on the motor, and means for balancing the reciprocatmg device, said reciprocating device being aXial of the float. n

. 5. A damper regulator comprising adamy per, a vertically and rectilinearly moving `membeigthe position of which is controlled member, said reciproca-ting device adapted to control the pressure in the motor to locate the piston at a position corresponding to the position of the reciprocating device.

' 7 A damper regulator comprising a dam'- per, a vertically moving member, the posi'- tion of which is controlled by the draft inluenced by said damper, a. pressure-controlled motor, said motor having a piston,

"connection therefor t0 the damper, and a y reciproca-tin device in axial alignment with "and control ed by the vertically moving member, said reci-procating deviceadapted to control the pressure in the motor to locate the piston at a position corresponding to the position of the reciprocating device, and means for balancing the reciprocating device. 8. A damper regulator comprising in part a motor havin a piston, an inverted vessel float influenced by the dampered draft, a reciprocating valve in the motor for controlling the position of the` piston therein to cause it to be located at positions corresponding to positions of the valve, said float being'suspended from said valve and `in axial alignment therewith.

9. A damper regulator comprising in part a motor havi a piston, an inverted vessel iioat influence by the dampered draft, a reciproca-ting valve in the motor for controlling the position of the piston therein to cause it to be located at positions corresponding to positions of the valve, Said oat being suspended from said valve, and a cord from said'valve, saidcord being under the control of a weight hook for receiving regulating weight.

10. The combination of a reciprocating draft-controlled balanced valve, of a motor having a Water inlet to admit a constant flovv of Water, a piston in the motor, and a longidevice in axial alignment with' yand controlled by the vertically moving tudinally Vextending Water-controlling port element in the motor adapted to be closed and opened progressively by the valve to control the length ofthe Water column in the motor above the piston, and means for l holding the piston up against the column of water. Y

11. A pressure-controlled motor for use with a reciprocating draft-controlled member, comprising a cylinder, a Water inlet |'port therefor, a chamber in the cylinder Wall' having an outlet, the cylinder Wall having a series of holesv into the chamber or their equivalent, said' reciprocating member adapted to move in said chamber free from `pressure and to closethe holes therein, for the purpose described.

12. A damper-controlling piston under the inuence of a constant flow of water, a cylinder inxvhich said piston is adapted to move, a series of outlets in different' longitudinal positions iin the motor or their equivalent, and a draft-controlled balanced valve for closin the outlets dependent upon its position, for the purpose described.

13. A' damper 'regulator comprising a tank, a Water motor on the tank with a constant' flow of Water therefrom, a draft-con- 'trolled float in the tanlr, a motor-controlling element under the influence of the iioat, and

means for automatically supplying the tank v with Water discharged from the motor.

14. A damper regulator comprising a damper connection, a piston under constant pressure of a flow of. motive fluid, a draft controlled reciprocating member and a balanced connection from the reciprocating member adapted to control the point of escape of the motive fluid from exertion of pressure against the piston.

15. A damper regulator comprising a damper,l an actuating member under constant pressure, and balanced connection therefor with the damper, a balanced member under control of the pressure in the damper-controlled chamber and connection therefor with the actuating member whereby the movement of the balanced member Will vary they pressure on the actuating member to shift the damper.

16. A damper regulator comprising a damper, an actuating member under constant pressure, with balanced connection therefor with the damper, means for changing the bal- Winer cnam. 

